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Highly sensitive biosensors based on all-dielectric nanoresonators.
Nicolò Bontempi1, Katie E Chong, Henry W Orton
1Nonlinear Physics Centre, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia. dragomir.neshev@anu.edu.au.
Nanoscale
|April 7, 2017
Summary
This study introduces a novel silicon nanodisk biosensor for highly sensitive medical diagnostics. The all-dielectric platform achieves unprecedented detection limits for biomolecules, advancing personal healthcare technology.
Area of Science:
- Nanophotonics
- Biosensing
- Dielectric Nanoresonators
Background:
- Plasmonic nanosensors offer high sensitivity but face limitations due to restricted quality factors and metal absorption heating.
- Current biosensing technologies require improvement for cost-efficient, high-speed, and compact personal medical diagnostics.
Purpose of the Study:
- To demonstrate an all-dielectric sensing platform using silicon nanodisks with optically-induced magnetic resonances.
- To overcome the limitations of plasmonic nanosensors in biosensing applications.
- To achieve significantly lower detection limits for biomolecules.
Main Methods:
- Fabrication of silicon nanodisks.
- Excitation of strong optically-induced magnetic resonances.
- Utilizing dielectric nanoresonators for biosensing.
- Detection of streptavidin concentration.
Main Results:
- The all-dielectric platform detected streptavidin at concentrations as low as 10-10 M (0.05 ng mL-1).
- Achieved a detection limit at least two orders of magnitude lower than current standards.
- Demonstrated the potential of silicon nanodisks for sensitive biosensing.
Conclusions:
- The developed silicon nanodisk platform offers a new direction for biosensing.
- Dielectric nanoresonators are bio-compatible, non-toxic, robust, and low-loss alternatives.
- Potential applications include disease diagnosis and drug detection in personal medicine.